In electronic parts datasheets we always see min/max values specified for voltages, currents, etc. together with the temperature ranges. Some values are tested by the manufacturer, some are specified as "guaranteed by design". However, are these min/max values for the specified temperature supposed to hold for the lifetime of the part? For example, if a supply current is given as min 10 mA and max 20 mA, with a typical of 15 mA for 25C operation, is this current expected to be within those ranges for the part's lifetime? If so, what is assumed to be the part's lifetime for which the datasheet is guaranteed: 1 year, 10 years? How can I find that information without having to ask each individual manufacturer?
To lead the discussion in a better direction and get to the main point of my question: Let's suppose we set up a controlled environment where we guarantee the datasheet temperature is maintained (let's say room temp), with all the parameters meeting the spec at nominal values. How long am I supposed to assume that the datasheet min/max will be maintained? If parameters start drifting beyond min/max 1 year in, is that a violation of the datasheet? 10 years in? Where's the cutoff if there is any?